Sheath thermocouple have shielded thermocouple wire of common length 500mm and sheath diameter Ф3~Φ8mm, with flexibility, high pressure resistant, fast thermal response time and long operating life. K type thermocouple can directly measure the temperature of liquid, vapor, gas medium and solid surface in the range of 0~950 ℃ in various production processes.

K type thermocouple assembles with protection head and stainless steel thermowell, with high pressure resistant, fast thermal response time and long operating life. Its thermo wire diameter is Ф2.5mm. K type thermocouple can directly measure the temperature of liquid, vapor, gas medium and solid surface in the range of 0~1000 ℃ in various production processes.

The nature of signal. RTD sensor itself has resistance. The change of temperature makes the resistance produce positive or negative resistance changes, and output resistance signal. The thermocouple generates induced voltage that changes with the temperature changes.

The temperature range detected by these two kinds of sensors is different. RTD sensor is used to low temperature detection while thermocouple is used to high temperature detection.

In the aspect of material, the thermistor is a single metal material with temperature sensitive changes character.

The thermocouple is thermometal, which is combined with two different metals. Due to the change of temperature, electric potential differences are produced on both ends of two different metal wire.The thermocouple has positive and negative poles and so does the extension wire. RTD sensor doesn't need extension wire, and it is cheaper than thermocouple. But RTD sensor requires power supply excitation, which can't instantaneously measure the change of temperature.